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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17b976b0716b72214bb109124941980bf8bf54cfafc45c4e6259a75ec67c59a2' 
  AND token = '1Cr0Mm7YmLzYdm9M3RucdS0GlxG0kKVTsarw5qMvC8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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