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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f04a9229afcb934fd685cc3b440fdb9ca9d4a6774bc95464a6b8bee061aa7bc8' 
  AND token = 'tMpeDF26MT1G0rgc2JAaB4V3OK1Avmxv3OaamgCkTDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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