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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '842b3d2b5cd43bc97cdc43bb7592d14f4b8981f26a10af58545f315e7c13de09' 
  AND token = 'RzLAfO0JdHFHbAMe5EEifEjoGuRK6P1CXQjf4nPHi1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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