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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d2379c8439c6c2a5db06f19cbe08ee3cdfd03ddf5e5d4c254fd9ff71f91eb61' 
  AND token = '0sQnmKiSCzZ7A0UzvHxnjDlTmrt8jCz9ydsVo5NYIuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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