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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f59fb07e0bd4e517bb037620cbfac73c6f8cba9ec2430e0b93c3de5cf5fa5251' 
  AND token = 'RZEDcOl2Bz988Up7UwLR/QJlx9+h2hZlrZdSqb2yaIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00106

JSON explain

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