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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f96eaed3e00ca8e3c4a43c826dd0cdd926dd2c188c6eb7679f5e2fe5065a5ee1' 
  AND token = '/oJTzXagsoy35fTZYPXC6krkH275EPXayOVeCV/d5O0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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