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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b146b830cfc92665e2681e0c338661d0ad3f0b2ea4e098e575fdb9056312a2e' 
  AND token = 'gC/4pmVhq/XSKeF6572kPQO9psq2GfWNPEVukdHAEv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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