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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f172a9d6ebd6c214e1782b449ca68e3128f0b39c9a0d4924182df31f22b8a1af' 
  AND token = 'dHVMx6RZlnq7631/Wesn6oG7ifQ7L0vRbOkWFuHvhAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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