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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5170f6be939765f447a27c978d72cbaf451127b671691561c3505b1c7a1c712' 
  AND token = 'sKvGpUT+xArDi7nlX6Ohk8h0s7UyF8qL5phM8N7GuZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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