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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f70a3031d4cdd0a2e152c6b3907724390b5a9c86d4970c6545248b9e7d814bab' 
  AND token = 'OXF54zSpsaoBDAdHB6tnh0VKbfQCr9D9lMKZygZrwUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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