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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d0c3a3ba70c322c46e6278294fdc513e8e3ac2f6b64a46bf6301784ce0fdabd' 
  AND token = '4ga3+6iptt2vrjk3Wi+zMQwDgjAKcdSJvHCzTXWqnnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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