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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0eb34f25b9d06e7522b91e4c55fe13f87dc89965102f0110d7aa51129499c05' 
  AND token = '8PXqVVVEn/Sk9Vb4ipT58PbMt2RgeX3i40q4mLKyQxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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