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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8907ee79cb1da1ec000420f31a98bcc263d43e91e39ac5933752769cc8bab378' 
  AND token = '8uSoxXJzcRtq5MVk4vpLF+d49bqycEUXw3gz+yQ2TM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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