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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d53c3ce920044ededb4a9f1bb2dfc80427099bc37587426eb8f5cf0f690d69c' 
  AND token = 'y3wn6G+CH03yM/yDODFwUZlTIPLEOuBBEx7cwUZEQME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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