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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b19b58aee163166fd99625a0c1a10496004730c5ab4a9670114d5bc890431c37' 
  AND token = 'E2BDsWJ5XG2kHyR2gnvgs0shhxr/tFQ/VfsKyhiz47E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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