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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b2aa14d9c882a6c941e4f5cd39c51a2a352651399b9d5ec4b11786c7cf7c9d2' 
  AND token = 'Dl5JlzyS9+xq7cwQXzGZV66QzEm9IZw3lgHgQw+zcDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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