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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6544723d0427a9cb156ab4d430a00f30035caa1e33ebdb602548d3f379b4175a' 
  AND token = 'Mp0gjY1j/4PgNmtjtN8GGJunS4tlLpB/Mos0FbEKIxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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