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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50aa048f60c3f7d189252dbb71292a937fa90ae3f3e2d2fc106fb08e9e47df19' 
  AND token = 'CWxYXYgGq64OVNUoejIdOTRpkwlsfhHklTI7gyioFeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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