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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '693c26c92845f53961d3446e7e11b4187d72e90c3176348382849a801409a67d' 
  AND token = 'XSgVwJEX29fJk3r21n2C+dk/Wkg+x68xpTj430gZ/J0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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