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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d5f712bb6852c7698200c8334dd86ae17d20f718f01c15da2c2c0c363121333' 
  AND token = 'b6/Y2qWFTiXhIiwsu8iddwNfd0W5Csqy7fve9j+uL6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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