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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25915b7eb3ffb707165c199b677be268ccbd402b4af5b85223575014b2d6a80b' 
  AND token = 'PTUimOfB5yCCUdyy6eO4GMy6m7Dy5jOwAwtcdNfEbd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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