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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91c13cddf6fe2b934a6d3db43361aed3a7680b7c821fc75ab5d79c0609028fcd' 
  AND token = 'ke1VQ5VmhGpEDe31dFGlOig/Uz/idsZVLoUanUvpY/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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