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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59279537ee2fb4ab5560ce9f295bbb395e03af7301a41ace528f74b6b3e0d42c' 
  AND token = 'V33VFZnx78jTKl0qT6iWgxXCNVG8sQMT4XA6zSgx2yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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