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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdebfe9efd8905f3da9519a9116ebf4baffc8691d3991f0693faebba69d34862' 
  AND token = 'oEytVUxoO1vqh3xllhx6Vo+cs1Hbg8GYFpaheOM57zQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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