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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34367df005e436fedcb939486e10f640f43cc2397415918e290aac7166723a73' 
  AND token = 'o9NUJLStUPIxUdUqbHhRgyR+2ZM39I1C+rcFtZuOgqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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