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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b92b0aa328f51c6f6ffba40cf17679b1cb112b92422490d21160b47e923bb3fb' 
  AND token = '0u/5XpD3S5aki+yqcaz5lPoN/NFRp2MgV1PzVcFBHUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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