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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '083eb3fe6d90378ed4e4ae9aaacede503f9a2f4d82ac2331a6e5be1a16b92390' 
  AND token = 'P3dp3ly1eJ2dl9czIPqd51K7RhNHtHlCvnF7j5ABzZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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