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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e961c45e292fbfe4c8eb548569c4be35c7c6090fadc8cbdb144e92e7a35cdf14' 
  AND token = 'UIrE7T1T39CQGWkxuEmX2ohJTC9+eHGXbi3u3Iy9CdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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