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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed01326304e92f4f8cc3adde9f3335811d0f34a3660e14f578e452aac33238cd' 
  AND token = '3m4Fksz3gOuMloMQ6bYTyOlh9iYJXQVMbc8iekYYf0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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