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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef7c2010f16988a270c408400428c2fe16448e8ca75da2a38bad30690731c9e6' 
  AND token = 'Qn0z5bdaQ/vmMy0o3IxkBbTU5XcjW/I9me7AB8R8hPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00095

JSON explain

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