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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89b7520aa40ba15e7bd5b84ad83b55f3fff882ba427e031376270cb02a22364d' 
  AND token = 'pA6lQAYxt+L80ye8Rztnz6AiV55iI8Ty8O89coP+44c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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