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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fe327d4315aabcffce84856921350f40f38378f8d8b8d1c38ef5fb16bf1cd02' 
  AND token = '5XoM72eVTkhI2Xibabt6vtKWPQ6ghkAUNf8pbvuvRz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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