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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db3014c582a996b2cde3b92de02d6ccdca360a16ad85b45223f9ab4db7c43ae9' 
  AND token = 'qYIVG0CMDmNeg12YgxvE1+i1lmO7TIJWo8qvFXWT/Zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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