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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9da29fbcfb855cb03524ba0e5b414086c152ef77ff0fa051554fcf35a0830081' 
  AND token = 'g0Vs4KmQq4Nt+H+pP7rbSHtjb7q1fo54oD9EJRLpOEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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