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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62455dd5dd5ebebd351698f7b78fd1c6efb14dc6b4925ba5df6a8b96996c8105' 
  AND token = 'ulNtuaAdtXuYDf/ypM96Acp5j1bu/nez+11FrT7VhCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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