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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ee3a5750cb4c9e61f232bd32f3e4ec44c61b82ecfbc3813022c44f427d7879e' 
  AND token = '9dGxG5YDKVuEx3VqDT2pt1VtMAakCRbw9D1PNPWjOe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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