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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bc59b240cea343570ca4d29c60bb9ad26f745796a826442fa06944f24c1cf54' 
  AND token = 'VkE6W98luW49HQ/mS8PwvR27/kmIxB6ffkpRMxihKMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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