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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af64590be2d47c4f3eaf42760733c3bef91c3e74025cba90bbf7b7d149592773' 
  AND token = 'b5kDNq7Zv6VjGp87hmKl/nUrAI5Dcv1jkWE1E3Zvk+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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