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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ab6ab0bec5dba0dfb5eef0c687b2d57c5d92411b9ba33bb22ef77ad4df162b6' 
  AND token = '1eD8eSgzYah6h33vbKpqn8PeBUu5A+ph2QgkwnkGfC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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