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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a184e4a9f297487de64d3a1e7e6f9d0d3cb256a19e3016d73b401b5edd71e59d' 
  AND token = 'N0AYph9x7YFR3OyzoDMhH1dEMcWiNrEuUU0X0UbLR/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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