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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4736e95e74364635101f1167712519b9e7f1e49ff19d8b2c67439f8a0396278' 
  AND token = '5RaUXwToUZZnvGu0vyM/a8gkp+OofR9I9fvAx48bF64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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