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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08c990ccf6adf3e6c054a1ca890b369021d9051a7b0188949372df71d99267b7' 
  AND token = 'UJIdvGGcwF7F4wtGpEOu3X5N7g4k7Xhdmfc1l4ihwO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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