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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74f186ee13607c8bfefad6848d120c41b1d6794b162d9bd8a5c30dc0e57a3a4f' 
  AND token = '/1gBQMEwQ1RMjGfO5AloBIy86SadZhUUVoY5RgKaPAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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