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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1882ffdcce00c42a6bf8ba47d062d4d499d0ed02579769761c8311107b2af46' 
  AND token = 'ClpTk5Q2SlR1pgeIWyrkObGP7YhiMgnNfSPs59m+p7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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