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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17131ba3069698716c256e8a5598be89292d2438585f2ba97d4e38f6eb2b6d29' 
  AND token = 'R7p0yNe4JFubU2ElmlOApf+rQq8nNwXu+qFSlblYUz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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