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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cb9b7684ed5a82f0de73560f71059e94eed7353d1d1e1079e4ffbedc79fc4f3' 
  AND token = 'VFQjTCJLy5o1VREnXCHJ9N3vR9n+Qvq7bMVFClNYK/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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