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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d57fcc921c9046c1939377d25afea4b3be7c9651c83a60830161b2c0cb305cc' 
  AND token = 'YXydl2undHeFKdl//dRJL3eby5Cl+tCqs0i0VywGkdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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