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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '881bdd3e69d40e43e084cd011c15c9928b3a774117d9bdedc0b4d7f38b76ed3d' 
  AND token = 'zR740LmyckLM+v7fntJcUi8nfj+3aWiQ3+9M7m59Dns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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