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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddc984221532770081e199626b3e4954bfa7c85fc5b20088d95a8b3ce765ba0f' 
  AND token = 'Azs3Jb9y1V80nYYvsQ9dvdHfoWCXKa96fGwK/Z9fgWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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