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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '414010af8c58db1d1e01563525ad4e33ec67df2f743a1f4d712713089ad56db0' 
  AND token = '4kPj6FqfnawiAkA2nmu6PWEgCS4xof6hZf5PhJYp2Nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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