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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c1e9131fdce2373012d5ec23df64c40c2d1311d1ee175d68ae0b812103cb009' 
  AND token = 'jOXEUSsK8HBqBdMwc5K0+nh0J12S7C4l/Um7tuJUv54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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