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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88a23b39a9876a7eb49b7730c8709ed7cd8ffd15df88e6e99ad66fcc3ab2f75e' 
  AND token = 'PXeH8KXGlfBNW45yeH32NwF/oApMKUFiPv+Qp81D478=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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