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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6946bec9b6aa2fe3fe569d44dc0179631a687f9a8a30c5b09dd4393b673d6f2' 
  AND token = 'AzYPMCFIyAs37BePxjrIXkuRV3ffTLQ+j8+f/eZ8yno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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