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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7c231d2696ed020a9d8250cf844b77cd834b2e71aeefc8575ffd2440536edbc' 
  AND token = '6BDcMz/ZkajHbluT7y3WyLz/03HBraGJDxqaDSdTbVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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