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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83d62279dbc8654713a0945c067faf12263d527bfc72c2d02bb66a8c65c248b1' 
  AND token = 'ql40kKm5PxKWoHm7VyMmoDxrqoDjYWUmXSnYAqnPRtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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