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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f99d1beaedf4d7086f830a443356931b8ccd7db6762155c8a5bc0dda18a93a4' 
  AND token = 'kJCJpQ5xRgCN8hDaHLxFMwpA1Rb2fLCWAF2OG5Z47Ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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