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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '309c6b328e0c6d8e806447f15938839e262d0fde0b2f921889cd820fb364ef5d' 
  AND token = 'zcwnCRcZuuApfkOe1M4WQaZxSiBafR9AHW8qjyVi1wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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