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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3eaf9d9e63f63730e2db7c534c8858035b55b6279af31f53fe89bf7c3c8651d' 
  AND token = '1uN8I4nv9E0D/Y0IdOSGoV/rpjIPtABOV+MMa4X3Ht4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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