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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03c8d8fae6673f4e620200e664463339b91131a18d4b8de3cd4dd828c07ffc26' 
  AND token = 'uHZddeFFAnwDumGvsTxxQNRNk0EpeWQNt1n7XbtWC8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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