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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c756b702a8948a88d10b91e0a8035f7e52ba931eabc954fe427871ca36049f9' 
  AND token = 'q37SX3Px3OaJabpWGbyaRxXKyUqRzJQSHD1rT+9ryW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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