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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '345cecebb47968ff861238ea6b13f006311f702139136ef76c2d3164da1ce6f7' 
  AND token = 'kyrLtN4Y4fdkII3S03pa4MctJFkQReTm78v6TQ7oc2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}