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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05631ac038fad8e6a14fedc3defe5a8585b08aced508e81b220d3c0928c8b67f' 
  AND token = 'k1StacehmTxyHcpxysnqP5RSMYFW8HG9AFiuwNFtQL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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