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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7c1557d7f53c7e6c185095de88b47f9963656e6f48d0db43c482f4fcccb1623' 
  AND token = 'JV7bJDONQpHHjzclyyufNMw2ZQTtH4Ep6FE7QZhZcoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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