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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a81b5dd1ed0409c50cc064081f3e51bd0ce408436f70ea4f744ebc1d4fb6ed9' 
  AND token = '7p/V8LMmFx676XmADv0m2Bcn/OWMuknP0q8dXTsLZIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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