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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06c8cda72d1434be80d558f45505b621f55488d07c80534cb5dfc68623ae8571' 
  AND token = 'IiXWwzKqGFqUOKuUWMvAur55ECAUf717/3RBa70Un8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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