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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9ae86e5b8f2b56fa942744d2a8cd32c8a470e76a1b422342e625783b4f687c2' 
  AND token = '1guVUTxfmV1UGJMpQ0Dhv5j1g8LlmCkGtaFemM87oLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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