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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1acce6c052f2daeeaef1eecaa8117f3d746e99f5ec1f144dfc5b583ce4b47aeb' 
  AND token = 'yydn9n4393SIHt9ZiWlF953hyED42UNniiQYXLz+U+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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