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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eca1cedbc5047e16227077d31b24fcb1648661bb0abb7916ad2ed989552c264' 
  AND token = '/TY4p7g5IJkHCY/cxrs72vpDTD5c30ko7N3gY6bQ8qE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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